Dmitriy Ryaboy (@squarecog) leads Twitter’s Analytics Infrastructure team, responsible for growing Twitter's analytics platform from a few dozen Hadoop nodes in 2010 to thousands of machines, multiple clusters and data processing frameworks, and hundreds of diverse use cases in 2013. He is a contributor to several open-source projects, including Twitter's Elephant-Bird library, Apache Pig, and the columnar storage format Parquet. His past employers include Cloudera, Ask.com, and Lawrence Berkeley National Laboratory. He holds degrees from Carnegie Mellon University and UC Berkeley.

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